Process of treating brewers&#39; slops.



0. S. ROBISON.

PROCESS OF TREATING BREWERS SLOPS.

APPLICATION FILED NOV. 1, 1909.

Patented Feb. 6, 1912.

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UNITED STATES PATENT OFFICE.

CLINTON S. RO.B.ISO'N,-OF CHICAGO, ILLINOIS.

I'BOCESS OF TREATING BREWERS SLOPS.

Specification of Letters Patent.

Application filed November 1, 1909. Serial No. 525,626.

Patented. Feb. 6, 1912.

Z '0 all whom it may cancer-11:.

Be it known that I, CLINTON S. RoBIsoN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Processes of Treating Brewers Slops, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming-a part of this specification.

My invention relates to a process for the recovery of salvage from grain drying.

In my co-pending application, Serial N 0. 514,069, filed August'21, 1909, I have described a process for accomplishing much the same result which I obtain in the present invention. In the above-named application, however, I perform the salvage operations by means "of passing through a filter press the liquor obtained from brewers slops after the first separation has been made, by which the coarser materials are separated from the liquor. It is well known that in this first preliminary separation a considerable amount of solid material, passes through the screen which isused to effect the separation, and this solid material is allowed to go to waste, together with the solutionwhich contains aconsiderable portion of sugars. According to my improved method, the material which has been wasted in this way is now recovered. There are several variations which may be used in connection with my process. The fundamental id'ea in, the present invention is to effect the separation of theliquid and solid constituents by means of a centrifugal separator. are usually employed a. preliminary separation, as explained above, is made, by whlch most of the solid materials are removed from the brewers slops. The filtrate is passed through" a centrifugal separator and the balance of the solid materlal is thereby removed. I have found that the operation of a centrifugal separator is such thatbut little additional drying is necessary after-the solid material-is removed from the separator.

In my co-pending application abovementioned I have stated that after the fil trate resulting from the first separation of solid material from brewers slops- 1s. itself filtered, this second resulting filtrate may' 'be evaporated and thesugars and other According to the processes which market as cattle I tank 5 is removed as desired through pipe 8 constituents held in solution may be recovered thereby. Also, I explained that instead of passing the filtrate resulting from the first separationthrough a filter press, this first filtrate could itself be evaporated, thereby recovering the solid constituents and the constituents held in solution at the same time. Similarly, in my present proce'ssI subject the filtrate from the first separation to centrifugal actionand thereby separate 7 all of the remaining material held in suspension, whereas the filtrate may be subjected to evaporation and the constituents held in solution may thereby be recovered. Suitable piping connections are used so that -the filtrate resulting from the first separathem. The-filtrate whichpasses through these screens, as explained above, contains a considerable amount of solid material and is delivered through the outlet 3 into the funnel 4, from which it passes into the storage tank 5. v The solid material remaining in the hopper 2 .is carried by the conveyor to the delivery pipe 7, at'which point this material is collected, ried, and placed on the cod. The mixture in the by means of pump 9, whichis operated by the motor '10. The liquid and .the solids held in suspension, after passing through pump 9, pass through pipe 11 to the T coupling 12., Connected with one branch of the T coupling 12 is the pipe 13, in which isplaced the valve 14; while connected with the other branch of the T couplin is the pipe 15, in whichis the valve 16. he plpe 15 connects directly with the evaporator -17, whereas the pipe 13 is provided with an outlet 18, from which the liquor may be delivered to the centrifugal separator 19.

This centrifugal separator 19 may be of any a filter cloth, such as canvas or the like. A

base plate 22 is provided below the rotatable portion 21 and there are openings 23 in this ase plate, through which the solid material retained within. the rotatable portion 21 may be passed into the delivery spout 24.

For the 'sake of simplicity, the driving mechanism of the centrifugal separator is not shown in the drawing, but is constructed in any ,of the well known Ways which are familiar'to all mechanics.

Connecting. with the space between the rotary member 21'and the shell 20 is the pipe 25, 1n wh1ch isplaced the T connection or T coupllng 26. Connected with one branch of,

this T coupling is the pipe 27, which connects with pipe 15 by means of T coupling 28. y In pipe 27 is placed the valve 29. Also connected with the T coupling 26 is the -p 1pe 30, in which is placed the valve 31.

This pipe delivers into the funnel 32, which is connected with waste pipe 33.

The operation of my process may now be thoroughly understood. The liquor is forced through pipe 11 by means of pump 9,

and if it is desired to. evaporate the liquor Q with no further treatment, valve '14 is closed and valve 16 opened. If however, it is desired to separate the sohd materials from the liquor contained in the tank 5, valve :16 is closed and valve 14 opened.

' The centrifugal separator 19 is placed in ioperation and the liquor passes through pipe 13 and delivery pipe 18 into the upper part of the separator, inwhich the solid materials are retained within the rotatable portion 21, and the filtrate is forced through the revolving screens and the canvas into the space between the shell 20 and the rotatable portion 21. This filtrate passesthrough pipe 25 and, if it is desired to evaporate the same, the valve 29 may be .opened and valve 31 closed, the solution thereby bein caused to pass into the separator 1-7. I on the other hand, it is not desired to evaporate the filtrate, valve 29 is closed and valve 31 opened, and the filtrate passes through pipe 30 into funnel 32 and from thence into waste pipe 33.

In some of-the improved types of centrifugal separators it is possible to have a steady delivery of thesolid materials retained in the rotatable portion 21 into the delivery spout 24, from which they may be withdrawn by removing the gate 34. In other types of separators it is necessary to periodically stop the separator and to remove the .solid materials which are con; tained therein either by tilting the separator or by forcing the solid materials downward into the delivery outlet. My process is equally applicable to use with any kind of centrifugal separator, but I prefer the form in which the solid materials are delivered through the bottom of the separator, as less labor is involved in this way'and a greater production is obtained.

The solid material which is delivered .through the outlet 24 may be subjected to further drying inany of the well known types of drying ovens, or in some cases may be used with no further drying. I

Many changes could be made in the details of the process which I have described without departing from the spirit of my invention.

What I claim as new and desire to cover by United States Letters Patent is:

1. The herein described process which comprises in first drawing the fluid portion from brewers slops, and subjectin said fluid portion to centrifugal act-ion, thereby removing the insoluble solid material held in suspension in said fluid portion. v 2. The herein described process which consists in first drawin from brewers slops, 'su jecting said fluid ,portion to centrifugal action to remove the insoluble solid material held in suspension,

and drying the solid material so removed.

3. The herein described process which" the fluid portion comprises first drawing the fluid portion from brewers slops, and immediately subjecting said fluid portion alone to centrifugal action, thereby removing the insoluble solid material held in suspension in said fluid portion.

In witness whereof, I hereunto subscribe.

my name this 29th day of October, A. D. 1909.

CLINTON S. ROBISON. Witnesses:

HENRY M. HUXLY, A. A. THoMA's. 

